Adjustable bed



FIG. 1 shows a perspective view of the present design.

FIG. 2 shows a front view of the present design; and,

FIG. 3 is a schematic drawing showing that the adjustable bed of the present design is adjusted to a flat posture.

The broken lines showing of structural feature is indeed for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design. 

CLAIM The ornamental design for an adjustable bed, as shown and described. 